CVE-2026-42530

high F5
CVSS v3 Base Score
8.1
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
EPSS Score
3.3%
Exploitation probability in 30 days
Top 13% most likely to be exploited
Attack Characteristics
Attack Vector
Network
Attack Complexity
High
Privileges Required
None
User Interaction
None
Confidentiality
High
Integrity
High
Availability
High
Published: June 17, 2026 (22 days ago)
Last Modified: July 2, 2026
Vendor: F5
Source: NVD

Description

NGINX Open Source has a vulnerability in the ngx_http_v3_module module. When NGINX Open Source is configured to use the HTTP/3 QUIC module, a remote unauthenticated attacker along with conditions beyond their control can use a specially crafted HTTP/3 session to reopen a QPACK encoder stream. This may cause a Use-after-Free in the NGINX worker process leading to a restart. Additionally, attackers can execute code on systems with Address Space Layout Randomization (ASLR) disabled or when the attacker can bypass ASLR. Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated.

CWE

CWE-416

Affected Products

f5 nginx gateway fabricf5 nginx ingress controllerf5 nginx instance managerf5 nginx open source

References

🔗 my.f5.com 🔗 access.redhat.com 🔗 bugzilla.redhat.com 🔗 security.access.redhat.com